Update app.py

app.py

@@ -203,7 +203,7 @@ EMB_NPY_PATH    = ARTIFACT_DIR / "chunk_embeddings.npy"
 RAG_META_PATH   = ARTIFACT_DIR / "chunks.parquet"
 
 # PDF source (HF-safe: rely on local /papers by default)
-LOCAL_PDF_DIR = Path("papers"); LOCAL_PDF_DIR.mkdir(exist_ok=True)
+LOCAL_PDF_DIR = Path("./literature_pdfs"); LOCAL_PDF_DIR.mkdir(exist_ok=True)
 USE_ONLINE_SOURCES = os.getenv("USE_ONLINE_SOURCES", "false").lower() == "true"
 
 # Retrieval weights